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# m07q18

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23 Jul 2008, 05:58
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If a lumberjack crew needs to secure a safety zone for cutting down the trees, how far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimeter is minimized? The first tree is the highest one.

1. The height of the first tree is 50m.
2. Currently the distance from the barrier to the top of the tree is 70 meters.

(C) 2008 GMAT Club - m07#18

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

S1 tells us that the tree, if cut down, will hit the ground no farther than 50 meters away from its origin. It is sufficient as we know that the barrier has to be at least 55 meters away. S2, without the height of the tree, is insufficient.
********************************************************************

We can find the from second one as well.
say hieght of tree is X .
Then X^2 + (X+5)^2 = 70^2

Am I thinking all right ?
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23 Jul 2008, 06:05
Yes, your answer is correct if you are considering the first tree longest.
What if the 2nd tree is longer than the 1st tree. Suppose the distance between both the tree is less than the difference between their heights. In that case both the statements are useless and answer is (E).

abhaypratapsingh wrote:
A lumberjack crew needs to secure a safety zone for cutting down the trees. How far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimieter is minimized?

1. The height of the first tree is 50m
2. Currently the distance from the barrier to the top of the tree is 70 meters

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

S1 tells us that the tree, if cut down, will hit the ground no farther than 50 meters away from its origin. It is sufficient as we know that the barrier has to be at least 55 meters away. S2, without the height of the tree, is insufficient.
********************************************************************

We can find the from second one as well.
say hieght of tree is X .
Then X^2 + (X+5)^2 = 70^2

Am I thinking all right ?
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31 Jul 2009, 00:16
The question has been modified. I've updated the first post to reflect the changes.
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09 Aug 2009, 21:57
just wanted to know what the correct answer then is>>>

coz i marked it as (D), each statement being sufficient on its own...
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10 Aug 2009, 00:01
The OA stays the same; it's A.

arvs212 wrote:
just wanted to know what the correct answer then is>>>

coz i marked it as (D), each statement being sufficient on its own...

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18 Sep 2009, 18:39
Quote:
If a lumberjack crew needs to secure a safety zone for cutting down the trees, how far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimeter is minimized? The first tree is the highest one.

The height of the first tree is 50m.
Currently the distance from the barrier to the top of the tree is 70 meters.

Stmt 1 we all know is suff.
Stmt 2:We know here that the first tree is the longest.
So,x^2+x^2=70^2
and so x=ht of the tree can be found out..
IMO: D
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22 Sep 2009, 12:38
How did you come up with that equation? What is that equation based on? Yes, we know that the first tree is the longest one. However, we still can't find its height with only that info.

Do you agree?
tejal777 wrote:
Stmt 1 we all know is suff.
Stmt 2:We know here that the first tree is the longest.
So, x^2+x^2=70^2
and so x=ht of the tree can be found out..
IMO: D

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30 May 2010, 01:44
Hi,

I second this doubt. In the question we are given the barrier perimeter is minimized. If we place the barrier away more than 5 m then we cant have the minimum perimeter. So, statement 2 is also sufficient. OA should be D.

dzyubam wrote:
How did you come up with that equation? What is that equation based on? Yes, we know that the first tree is the longest one. However, we still can't find its height with only that info.

Do you agree?
tejal777 wrote:
Stmt 1 we all know is suff.
Stmt 2:We know here that the first tree is the longest.
So, x^2+x^2=70^2
and so x=ht of the tree can be found out..
IMO: D

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31 May 2010, 00:54
S2 can't be sufficient on its own. Suppose the first tree is not the highest one. If the tree next to it is higher than the first one, it will need a bigger safety zone.
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31 May 2010, 01:02
1
KUDOS
I think we already have this condition in the question:

If a lumberjack crew needs to secure a safety zone for cutting down the trees, how far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimeter is minimized? The first tree is the highest one.

dzyubam wrote:
S2 can't be sufficient on its own. Suppose the first tree is not the highest one. If the tree next to it is higher than the first one, it will need a bigger safety zone.

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31 May 2010, 01:12

It's not stated in the question stem or S2 that the current position of the barrier follows the rule. We can't construct that equation unless we know exactly that the position of the barrier follows the rules. Moreover, we can't be sure that distance of 70 meters is measured to the tree closes to the barrier.

What do you think?
ykaiim wrote:
I think we already have this condition in the question:

If a lumberjack crew needs to secure a safety zone for cutting down the trees, how far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimeter is minimized? The first tree is the highest one.

dzyubam wrote:
S2 can't be sufficient on its own. Suppose the first tree is not the highest one. If the tree next to it is higher than the first one, it will need a bigger safety zone.

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31 May 2010, 01:32
I dont think we need that much reasoning. If I go with your point, then even S1 can't bring the solution.

Lets disect the question stem:
If a lumberjack crew needs to secure a safety zone for cutting down the trees, how far from a given tree should the safety barrier be put up so that it is at least 5 meters away from the danger area, and the barrier perimeter is minimized? The first tree is the highest one.

1. We need to place the barrier at >=5 away from the danger zone.
2. If we have to make the barrier perimeter minimum then, what I understand, the barrier has to be placed at no more than 5m away from danger zone. So, S2 becomes just like S1. So, we can solve for the distance.
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31 May 2010, 22:56
Can anyone explain more on this issue?
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01 Jun 2010, 00:31
This is not the best question. We will be rephrasing or replacing it.
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01 Jun 2010, 01:48
Kindly intimate me the rephrased question.

dzyubam wrote:
This is not the best question. We will be rephrasing or replacing it.

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01 Jun 2010, 02:29
I will update this thread when the question will be updated.
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11 Jul 2010, 05:44
My answer was E because of this barrier else A was sufficient.

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Re: m07q18   [#permalink] 11 Jul 2010, 05:44
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